Elonka Dunin, America’s leading code-breaker, who “appeared” in The Lost Symbol as Nola Kaye, teases readers with a puzzle that helps drive the plot: "Is the secret to the infamous and as-yet-unsolved Kryptos sculpture at the CIA truly 'buried out there somewhere'?"

Whee, "America's leading code-breaker"? Publicity's nice and all, but that's a bit much. "World's #1 expert on Kryptos", sure, but for a modern code-breaker, I'd be more inclined to list someone such as Bruce Schneier.